import pygame
from pygame.sprite import Sprite

# from settings import Settings


class Ship(Sprite):
    def __init__(self, ai_settings, screen):
        super(Ship, self).__init__()
        # 初始化飞船并设置其初始位置
        self.screen = screen
        self.ai_settings = ai_settings
        # 加在飞船图像并获取其外接举行
        self.image = pygame.image.load("D:/py/pygame/image/ship.jpg")
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        # 将每艘新飞船放在屏幕底部中央
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom
        # 移动标志
        self.moving_right = False
        self.moving_left = False
        self.moving_UP = False
        self.moving_DOWN = False
        # 在飞船的属性center中存储小数值
        self.center = float(self.rect.centerx)
        self.bottom = float(self.rect.bottom)

    def update(self):
        # 根据移动标志调整飞船位置 不出屏幕
        if self.moving_right and self.rect.right < self.screen_rect.right:
            # self.rect.centerx += 1
            self.center += self.ai_settings.ship_speed_factor
        if self.moving_left and self.rect.left > 0:
            # self.rect.centerx -= 1
            self.center -= self.ai_settings.ship_speed_factor
        if self.moving_UP and self.rect.top > 0:
            self.bottom -= self.ai_settings.ship_speed_factor
        if self.moving_DOWN and self.rect.bottom < self.screen_rect.bottom:
            self.bottom += self.ai_settings.ship_speed_factor
        # 根据self.center更新rect对象
        self.rect.centerx = self.center
        self.rect.bottom = self.bottom

    def blitem(self):
        # 在指定的位置绘制飞船
        self.screen.blit(self.image, self.rect)

    def center_ship(self):
        self.center = self.screen_rect.centerx
        self.bottom = self.screen_rect.bottom
